{"title":"Calcium and magnesium","description":"\u003cp\u003eLimes, gypsum, shell flours, dolomite and Epsom salts. Lime moves pH; gypsum adds calcium without moving it.\u003c\/p\u003e","products":[{"product_id":"superfine-ag-lime","title":"Superfine AgLime (calcium carbonate)","description":"\u003ch2\u003eSuperfine AgLime (calcium carbonate)\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eSuperfine AgLime is finely ground agricultural lime, a calcium carbonate from local Otago quarries. Use it to raise soil pH and supply calcium in garden beds, compost and living soil mixes.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: amendment (liming material)\u003c\/li\u003e\n\u003cli\u003eAnalysis: 90% calcium carbonate, which is about 36% calcium (Ca)\u003c\/li\u003e\n\u003cli\u003eUse for: raising soil pH, supplying calcium\u003c\/li\u003e\n\u003cli\u003eRate: 130 g (half a cup) per square metre, mixed in and watered\u003c\/li\u003e\n\u003cli\u003eParticle size: passes a 100 micron mesh\u003c\/li\u003e\n\u003cli\u003ePack: bulk 500 kg and 1000 kg by quote\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eScreened fine lime from local Otago quarries. This lime is superfine: it passes a 100 micron mesh. Fine particles dissolve sooner than ordinary ag lime, so the pH change starts earlier and the lime is used up sooner. 90% calcium carbonate, which is about 36% calcium (Ca).\u003c\/p\u003e\n\u003cp\u003eBulk is available in 500 kg and 1000 kg quantities. Email store@seaclifforganics.nz for a quote.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe carbonate reacts with soil acid and raises pH. The calcium is what is left behind.\u003c\/li\u003e\n\u003cli\u003eIn an acid soil, lifting pH lowers the soluble aluminium and manganese that hold roots back.\u003c\/li\u003e\n\u003cli\u003eMost garden crops and soil organisms do best between pH 6.2 and 7.2, which is the range we run living soil at.\u003c\/li\u003e\n\u003cli\u003eUse it as a calcium source only when the soil test shows calcium is short. If pH is already in range and calcium is low, gypsum adds calcium without moving pH.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSoil test for optimum levels before you lime. Incorporate into the soil, or top dress through the growing season.\u003c\/li\u003e\n\u003cli\u003eNew beds: 130 g (half a cup) of lime per square metre of garden. Mix in and water in.\u003c\/li\u003e\n\u003cli\u003eEstablished plants: top dress 195 g (three quarters of a cup) per square metre.\u003c\/li\u003e\n\u003cli\u003eCompost bins: 65 g (a quarter of a cup) of lime per layer of compost to help it break down.\u003c\/li\u003e\n\u003cli\u003eFine lime works quickly. Apply the rate the test calls for, then retest before repeating.\u003c\/li\u003e\n\u003cli\u003eWood ash is also a liming material. Count it if you use both.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-60-ph-is-not-a-calcium-test\"\u003epH is not a calcium test\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-45-calcium\"\u003eCalcium: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-69-wood-ash-is-lime\"\u003eWood ash is lime in disguise\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open the bag in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and dry.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"2kg","offer_id":31202033434729,"sku":"SCOAGLI02KG","price":8.9,"currency_code":"NZD","in_stock":true},{"title":"10kg","offer_id":31202033467497,"sku":"SCOAGLI10KG","price":16.9,"currency_code":"NZD","in_stock":true},{"title":"25kg","offer_id":31202033500265,"sku":"SCOAGLI25KG","price":32.9,"currency_code":"NZD","in_stock":true},{"title":"Ton","offer_id":33037789200407,"sku":"SCO8200010","price":600.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/files\/SeacliffMockBags-SuperfineAglime1WM.jpg?v=1747708000"},{"product_id":"bluff-oyster-shell-flour","title":"Crushed Bluff Oyster Shells (calcium carbonate + Chitin)","description":"\u003ch2\u003eCrushed Bluff Oyster Shells (calcium carbonate + chitin)\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eCrushed Bluff Oyster Shells are a slow acting calcium carbonate grit made from Bluff oyster shell. Growers use oyster shell flour as a slower alternative to ag lime that holds pH up over a long time in beds and living soil mixes.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: amendment (liming material, shell grit)\u003c\/li\u003e\n\u003cli\u003eAnalysis: calcium (Ca) 36.50%, about 95% calcium carbonate\u003c\/li\u003e\n\u003cli\u003eUse for: slow, long lasting calcium and pH hold in beds, pots and reused living soil\u003c\/li\u003e\n\u003cli\u003eRate: by soil test and pH meter; no fixed rate is printed for this product\u003c\/li\u003e\n\u003cli\u003ePack: bulk 500 kg and 1000 kg by quote\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eCrushed shell from Bluff oysters. The composition is around 95% calcium carbonate, with small amounts of magnesium, sodium, iron and trace elements, as the batch analysis below shows. The shell's organic matrix is where the chitin in the name comes from.\u003c\/p\u003e\n\u003cp\u003eBulk is available in 500 kg and 1000 kg quantities. Email store@seaclifforganics.nz for a quote.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eShell is the same carbonate as lime, so it neutralises soil acid and raises pH. As a grit rather than a fine powder it dissolves slowly, which is why growers use it where they want a long, gentle pH hold rather than a quick lift.\u003c\/li\u003e\n\u003cli\u003eSupplies calcium for cell walls and root tips as it dissolves.\u003c\/li\u003e\n\u003cli\u003eUsed in place of ag lime by growers who want the slower release and the trace elements that come with shell.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAnalysis\u003c\/h3\u003e\n\u003cp\u003eBatch analysis (supplier laboratory test, November 2021)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNitrogen (N) 0.00%\u003c\/li\u003e\n\u003cli\u003ePhosphorus (P) 0.00%\u003c\/li\u003e\n\u003cli\u003ePotassium (K) 0.00%\u003c\/li\u003e\n\u003cli\u003eSulphur (S) 0.00%\u003c\/li\u003e\n\u003cli\u003eCalcium (Ca) 36.50%\u003c\/li\u003e\n\u003cli\u003eMagnesium (Mg) 0.30%\u003c\/li\u003e\n\u003cli\u003eSodium (Na) 0.30%\u003c\/li\u003e\n\u003cli\u003eIron (Fe) 0.06%\u003c\/li\u003e\n\u003cli\u003eCopper (Cu) 2.8 ppm\u003c\/li\u003e\n\u003cli\u003eManganese (Mn) 14 ppm\u003c\/li\u003e\n\u003cli\u003eZinc (Zn) 7.7 ppm\u003c\/li\u003e\n\u003cli\u003eBoron (B) 20 ppm\u003c\/li\u003e\n\u003cli\u003eCobalt (Co) under 1 ppm\u003c\/li\u003e\n\u003cli\u003eMolybdenum (Mo) 4 ppm\u003c\/li\u003e\n\u003cli\u003eSelenium (Se) under 10 ppm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOyster shells will increase pH. Use a pH meter to keep your soil between 6.2 and 7.2.\u003c\/li\u003e\n\u003cli\u003eMix into beds or living soil mixes, or top dress, at the rate your soil test calls for.\u003c\/li\u003e\n\u003cli\u003eSlow means slow: a coarse grit keeps releasing for seasons, so do not add more because nothing happened in the first month.\u003c\/li\u003e\n\u003cli\u003epH is not a calcium test. Check the calcium line on the report before adding any carbonate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-45-calcium\"\u003eCalcium: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-60-ph-is-not-a-calcium-test\"\u003epH is not a calcium test\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-41-calcium-magnesium-till\"\u003eCalcium, magnesium, and the one-off till\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open the bag in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and dry.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"2kg","offer_id":31202140913769,"sku":"SCOBOS1.5KG","price":20.0,"currency_code":"NZD","in_stock":true},{"title":"4kg","offer_id":31202140946537,"sku":"SCOBOS4KG","price":32.0,"currency_code":"NZD","in_stock":true},{"title":"10kg","offer_id":31202140979305,"sku":"SCOBOS10KG","price":65.0,"currency_code":"NZD","in_stock":true},{"title":"25kg","offer_id":39957376401431,"sku":null,"price":125.0,"currency_code":"NZD","in_stock":true},{"title":"1 Tonne","offer_id":40538911113239,"sku":null,"price":500.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/files\/SeacliffMockBags-CrushedBluffOysterShells1WM.jpg?v=1747707996"},{"product_id":"fish-bone-meal","title":"Fish Bone Meal (phos\/calcium\/ nitrogen)","description":"\u003ch2\u003eFish Bone Meal (phosphorus, calcium, nitrogen)\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eFish Bone Meal is a ground fish bone fertiliser that supplies phosphorus and calcium, with some nitrogen and collagen. It suits soil building, potting mixes and a pre-flower top dress for medical cannabis, vegetables and fruit.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: single input amendment (ground fish bone)\u003c\/li\u003e\n\u003cli\u003eSupplier certificate on file: BioGro licence 5252. \u003ca href=\"\/pages\/organic-certificates#fish-bone-meal\"\u003eSee the certificate and its dates\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eAnalysis: 4% nitrogen, 29.5% phosphorus as P\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e5\u003c\/sub\u003e (12.9% elemental P), 25.1% calcium, 0.45% magnesium (United Fisheries certificate of analysis)\u003c\/li\u003e\n\u003cli\u003eUse for: phosphorus and calcium in soil mixes and potting media, and as a top dress before flowering\u003c\/li\u003e\n\u003cli\u003eRate: 8 kg (8 litres) per cubic metre of media, or 400 g (400 ml) per 50 litres\u003c\/li\u003e\n\u003cli\u003eBulk density: 8 litres of fish bone meal weighs about 8 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eFish Bone Meal is made from fish bone, dried and ground. Bone is mostly calcium phosphate, so the meal carries about two parts calcium to one part phosphorus by weight, plus the nitrogen and collagen left in the bone.\u003c\/p\u003e\n\u003cp\u003eThe analysis below is the United Fisheries certificate of analysis (ICP-MS) for the Calcium Fish Bone MCHC powder we sell. Nitrogen is worked out from the certificate protein figure (24.75% protein divided by 6.25).\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSupplies phosphorus for energy transfer, root growth and flowering.\u003c\/li\u003e\n\u003cli\u003eSupplies calcium for cell walls and root tips.\u003c\/li\u003e\n\u003cli\u003eAdds a small amount of nitrogen (4%) as the bone protein and collagen break down.\u003c\/li\u003e\n\u003cli\u003eReleases slowly: the phosphorus in bone is not water soluble and becomes available as soil biology works on it.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAnalysis\u003c\/h3\u003e\n\u003cp\u003eNPK = 4 - 29.5 - 0 (N, P\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e5\u003c\/sub\u003e, K\u003csub\u003e2\u003c\/sub\u003eO); elemental 4 - 12.9 - 0\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNitrogen (N): 4.0% (from 24.75% protein)\u003c\/li\u003e\n\u003cli\u003ePhosphorus (P\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e5\u003c\/sub\u003e): 29.47%\u003c\/li\u003e\n\u003cli\u003ePhosphorus (P, elemental): 12.86%\u003c\/li\u003e\n\u003cli\u003eCalcium (Ca): 25.14%\u003c\/li\u003e\n\u003cli\u003eMagnesium (Mg): 0.45%\u003c\/li\u003e\n\u003cli\u003eCollagen: 14.27%\u003c\/li\u003e\n\u003cli\u003eAsh: 68.0%\u003c\/li\u003e\n\u003cli\u003eMoisture: 1.9%\u003c\/li\u003e\n\u003cli\u003eMercury (Hg): 0.07 mg\/kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eModified media or potting soil: 8 kg (8 litres) per cubic metre.\u003c\/li\u003e\n\u003cli\u003eSmaller batches: 400 g (400 ml) per 50 litres of media.\u003c\/li\u003e\n\u003cli\u003eSoil: a handful per plant at transplant or before budding.\u003c\/li\u003e\n\u003cli\u003ePhosphate stays close to where it lands, so mix it through the root zone rather than leaving it on the surface.\u003c\/li\u003e\n\u003cli\u003eHigh soil phosphorus reduces how much a plant trades with mycorrhizal fungi. Test before adding more to a soil that is already high in Olsen P.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-43-phosphorus\"\u003ePhosphorus: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-45-calcium\"\u003eCalcium: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-17-phosphorus-mycorrhizae\"\u003eToo much P turns mycorrhizae down\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and dry.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"2kg","offer_id":32583627702377,"sku":"SCOFIBM01.5KG","price":37.5,"currency_code":"NZD","in_stock":true},{"title":"4kg","offer_id":41557103673367,"sku":"SCOFIBM04KG","price":59.9,"currency_code":"NZD","in_stock":false},{"title":"25kg","offer_id":39957375713303,"sku":"SCOFIBM025KG","price":267.9,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/files\/SeacliffMockBags-FishBoneMeal1WM.jpg?v=1747707975"},{"product_id":"magnesium-sulfate-epsom-salts","title":"Magnesium Sulphate","description":"\u003ch2\u003eMagnesium Sulphate (Epsom salts)\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eMagnesium Sulphate, also called Epsom salts, is a soluble salt that supplies magnesium and sulphur, 10.00% magnesium and 13.00% sulphur. It suits growers correcting a magnesium deficiency on flowering, fruiting or vegetable crops, as a foliar spray or through the soil.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: soluble mineral salt (amendment)\u003c\/li\u003e\n\u003cli\u003eSupplier certificate on file: BioGro licence 297. \u003ca href=\"\/pages\/organic-certificates#magnesium-sulfate-epsom-salts\"\u003eSee the certificate and its dates\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eAnalysis: magnesium 10.00%, sulphur 13.00%\u003c\/li\u003e\n\u003cli\u003eUse for: correcting magnesium deficiency on flowering, fruiting and vegetable crops\u003c\/li\u003e\n\u003cli\u003eRate: foliar 110 g (6 tablespoons) per 10 litres of water once a month\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eMagnesium sulphate heptahydrate, the crystalline salt sold as Epsom salts. It dissolves fully in water, so it is quick acting as a soil drench or foliar spray and does not change soil pH.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMagnesium is the atom at the centre of chlorophyll, so a shortage shows as yellowing between green veins on the older leaves first.\u003c\/li\u003e\n\u003cli\u003eMagnesium is also a cofactor for many plant enzymes, including those involved in energy transfer and sugar movement.\u003c\/li\u003e\n\u003cli\u003eThe sulphate half supplies sulphur, used for proteins, oils and flavour compounds.\u003c\/li\u003e\n\u003cli\u003eBecause it is fully soluble it corrects a deficiency faster than dolomite lime, which is the slow, pH raising magnesium source.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAnalysis\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSulphur (S) 13.00%\u003c\/li\u003e\n\u003cli\u003eMagnesium (Mg) 10.00%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFoliar spray: 6 tablespoons (110 g) per 10 litres of water once a month.\u003c\/li\u003e\n\u003cli\u003eFor more frequent use, cut the dose to 1.5 tablespoons (27 g) per 10 litres of water once a week.\u003c\/li\u003e\n\u003cli\u003eSpray with the lights off or in the cool of the day and wet both sides of the leaf.\u003c\/li\u003e\n\u003cli\u003eMagnesium competes with potassium and calcium for uptake, so adding magnesium a soil does not need can induce a potassium or calcium shortage. Yellowing between the veins has other causes too; confirm with a soil or leaf test before treating. Magnesium sulphate does not lift pH; if the soil is acid and short of magnesium, \u003ca href=\"\/products\/dolomite-lime\"\u003edolomite lime\u003c\/a\u003e does both jobs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-46-magnesium\"\u003eMagnesium: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-47-sulphur\"\u003eSulphur: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-86-mulders-chart-what-blocks-what\"\u003eMulder's chart: what blocks what\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and dry.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"2kg","offer_id":33030314590231,"sku":"SCOMAGS02KG","price":8.9,"currency_code":"NZD","in_stock":true},{"title":"4kg","offer_id":33030314622999,"sku":"SCOMAGS04KG","price":18.9,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/files\/SeacliffMockBags-MagnesiumSulphate1WM.jpg?v=1747707972"},{"product_id":"calphos-colloidal-soft-rock-phosphate","title":"Colloidal Soft Rock Phosphate (ACO Organic calcium phosphate)","description":"\u003ch2\u003eColloidal Soft Rock Phosphate (ACO Organic calcium phosphate)\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eColloidal Soft Rock Phosphate is a clay based calcium phosphate rock, a slow phosphorus and calcium source for living soil, compost and garden beds. It is not the same as hard rock phosphate: the colloidal clay form is finer and releases to soil life more readily.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: amendment (phosphorus and calcium)\u003c\/li\u003e\n\u003cli\u003eOrganic input status: ACO registered farm input 456AI (NTS). \u003ca href=\"\/pages\/organic-certificates#calphos-colloidal-soft-rock-phosphate\"\u003eSee the details and dates\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eAnalysis: 8 to 9% phosphorus (18 to 21% as P\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e5\u003c\/sub\u003e), 19.3% calcium, 15 to 26% silicon\u003c\/li\u003e\n\u003cli\u003eUse for: slow phosphorus and calcium in soil mixes, compost and beds\u003c\/li\u003e\n\u003cli\u003eRate: 130 g to 650 g per square metre, broadcast and incorporated\u003c\/li\u003e\n\u003cli\u003eCertification: ACO (Australian Certified Organic) input, as stated in the product name\u003c\/li\u003e\n\u003cli\u003ePack: bulk 500 kg and 1000 kg by quote\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eSoft rock phosphate is a colloidal clay based calcium phosphate, supplied by Nutri-Tech Solutions. It is not to be confused with regular (hard) rock phosphate. It carries 8 to 9% phosphorus (18 to 21% as P\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e5\u003c\/sub\u003e), 19.3% calcium, 15 to 26% silicon and a range of trace elements, and is part of our soil regeneration programme as a microbe friendly phosphorus source.\u003c\/p\u003e\n\u003cp\u003eBulk is available in 500 kg and 1000 kg quantities. Email store@seaclifforganics.nz for a quote.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePhosphorus drives energy transfer in the plant (ATP), early root growth, flowering and seed set. A shortage shows as purple old leaves and slow, cold roots.\u003c\/li\u003e\n\u003cli\u003eAlmost none of the phosphorus is water soluble. Root acids and soil microbes release it over seasons, so it feeds the soil rather than spiking one crop.\u003c\/li\u003e\n\u003cli\u003ePhosphate binds to soil within millimetres of where it lands, so losses by leaching are small. That also means it needs to be mixed into the root zone, not left on top.\u003c\/li\u003e\n\u003cli\u003eThe calcium and silicon come along with the phosphorus: every amendment brings passengers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAnalysis\u003c\/h3\u003e\n\u003cp\u003eTypical analysis (Nutri-Tech Solutions), % by weight\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNitrogen (N) 0.00%\u003c\/li\u003e\n\u003cli\u003ePhosphorus (P\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e5\u003c\/sub\u003e) 20.62%\u003c\/li\u003e\n\u003cli\u003ePhosphorus (P, elemental) 9.00%\u003c\/li\u003e\n\u003cli\u003ePotassium (K\u003csub\u003e2\u003c\/sub\u003eO) 0.84%\u003c\/li\u003e\n\u003cli\u003ePotassium (K, elemental) 0.70%\u003c\/li\u003e\n\u003cli\u003eSulphur (S) 0.15%\u003c\/li\u003e\n\u003cli\u003eCalcium (Ca) 19.30%\u003c\/li\u003e\n\u003cli\u003eMagnesium (Mg) 0.46%\u003c\/li\u003e\n\u003cli\u003eSodium (Na) 0.00%\u003c\/li\u003e\n\u003cli\u003eIron (Fe) 2.00%\u003c\/li\u003e\n\u003cli\u003eSilicon (Si) 15 to 26%\u003c\/li\u003e\n\u003cli\u003eManganese (Mn) 1100 ppm\u003c\/li\u003e\n\u003cli\u003eZinc (Zn) 260 ppm\u003c\/li\u003e\n\u003cli\u003eCopper (Cu) 130 ppm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompost: 650 g or 500 mL per cubic metre.\u003c\/li\u003e\n\u003cli\u003eModified media and potting soil: 650 g to 3.5 kg, or 500 mL to 2.5 L, per cubic metre.\u003c\/li\u003e\n\u003cli\u003eModified media and potting soil: 32.5 g to 175 g, or 25 mL to 135 mL, per 50 L.\u003c\/li\u003e\n\u003cli\u003eSoil grown crops, broadcast and incorporate: 130 g to 650 g per square metre (1300 to 6500 kg per hectare).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-43-phosphorus\"\u003ePhosphorus: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-66-phosphate-stays-where-it-lands\"\u003ePhosphate stays where it lands\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-17-phosphorus-mycorrhizae\"\u003eToo much P turns mycorrhizae down\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open the bag in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and dry.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"500g","offer_id":40462328397847,"sku":"SCOCALPH500G","price":15.0,"currency_code":"NZD","in_stock":true},{"title":"2kg","offer_id":32469640183913,"sku":"SCOCALPH02KG","price":30.0,"currency_code":"NZD","in_stock":true},{"title":"4kg","offer_id":32469640216681,"sku":"SCOCALPH04KG","price":56.9,"currency_code":"NZD","in_stock":true},{"title":"20kg","offer_id":33030118899735,"sku":"SCOCALPH20KG","price":185.9,"currency_code":"NZD","in_stock":true},{"title":"1Ton","offer_id":32583609811049,"sku":"SCOCALPHTON","price":2999.9,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/files\/SeacliffMockBags-ColloidalSoftRock1WM.jpg?v=1747707970"},{"product_id":"dolomite-lime","title":"Dolomite Lime (calcium\/ magnesium)","description":"\u003ch2\u003eDolomite Lime (calcium and magnesium)\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eDolomite Lime is a calcium magnesium carbonate, a lime that supplies magnesium as well as calcium. Use it when a soil test shows pH and magnesium are both low, in garden beds, top dressing or compost.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: amendment (liming material)\u003c\/li\u003e\n\u003cli\u003eSupplier certificate on file: BioGro licence 297. \u003ca href=\"\/pages\/organic-certificates#dolomite-lime\"\u003eSee the certificate and its dates\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eAnalysis: calcium (Ca) 23.00%, magnesium (Mg) 11.00%\u003c\/li\u003e\n\u003cli\u003eUse for: raising soil pH where magnesium is also short\u003c\/li\u003e\n\u003cli\u003eRate: set by soil test; no fixed rate is printed for this product\u003c\/li\u003e\n\u003cli\u003ePack: bulk 500 kg and 1000 kg by quote\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eDolomite is a natural rock made of calcium carbonate and magnesium carbonate together, ground for garden use. It conditions soil and is used for top dressing garden beds and for helping compost bins break down.\u003c\/p\u003e\n\u003cp\u003eBulk is available in 500 kg and 1000 kg quantities. Email store@seaclifforganics.nz for a quote.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe carbonates react with soil acid and raise pH. Magnesium carbonate reacts more slowly than calcium carbonate, so dolomite lifts pH more slowly than Superfine AgLime.\u003c\/li\u003e\n\u003cli\u003eEvery dose adds magnesium: about 11 g for every 100 g applied. That is what makes it the right lime when magnesium is low, and the wrong one when it is not.\u003c\/li\u003e\n\u003cli\u003eMagnesium sits at the centre of chlorophyll. A shortage shows as yellowing between green veins on old leaves.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAnalysis\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNitrogen (N) 0.00%\u003c\/li\u003e\n\u003cli\u003ePhosphorus (P) 0.00%\u003c\/li\u003e\n\u003cli\u003ePotassium (K) 0.00%\u003c\/li\u003e\n\u003cli\u003eSulphur (S) 0.00%\u003c\/li\u003e\n\u003cli\u003eCalcium (Ca) 23.00%\u003c\/li\u003e\n\u003cli\u003eMagnesium (Mg) 11.00%\u003c\/li\u003e\n\u003cli\u003eSodium (Na) 0.00%\u003c\/li\u003e\n\u003cli\u003eIron (Fe) 0.00%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTest the soil before applying dolomite because of its high magnesium content.\u003c\/li\u003e\n\u003cli\u003eUse it for the magnesium the test calls for, and Superfine AgLime for the rest of the pH lift.\u003c\/li\u003e\n\u003cli\u003eMix into the soil before planting, top dress garden beds, or add a sprinkle to compost layers.\u003c\/li\u003e\n\u003cli\u003eDolomite on everything is an old habit. Excess magnesium is slow to undo: calcium from gypsum has to push it off the exchange sites.\u003c\/li\u003e\n\u003cli\u003eIf pH is fine and only magnesium is low, use magnesium sulphate instead of a lime.\u003c\/li\u003e\n\u003cli\u003epH is not a calcium test. Read pH, calcium and magnesium as three separate lines on the report.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-46-magnesium\"\u003eMagnesium: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-60-ph-is-not-a-calcium-test\"\u003epH is not a calcium test\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-41-calcium-magnesium-till\"\u003eCalcium, magnesium, and the one-off till\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open the bag in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and dry.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"2kg","offer_id":32986791411735,"sku":"SCODOL01.5KG","price":17.0,"currency_code":"NZD","in_stock":true},{"title":"4kg","offer_id":32986791444503,"sku":"SCODOL04KG","price":20.0,"currency_code":"NZD","in_stock":true},{"title":"25kg","offer_id":32986791477271,"sku":"SCODOL25KG","price":29.0,"currency_code":"NZD","in_stock":true},{"title":"1 Ton","offer_id":39265923039255,"sku":"SCO0110000","price":800.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/files\/SeacliffMockBags-DolomiteLime1WM.jpg?v=1747707918"},{"product_id":"gypsum-solution-grade-1","title":"Gypsum","description":"\u003ch2\u003eGypsum\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eGypsum is natural calcium sulphate, a powdered soil amendment that supplies calcium and sulphur without changing soil pH. Use it to add calcium when pH is already right, to loosen clay, and to correct a calcium to magnesium balance a soil test shows is out.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: amendment (calcium sulphate)\u003c\/li\u003e\n\u003cli\u003eSupplier certificate on file: BioGro licence 297. \u003ca href=\"\/pages\/organic-certificates#gypsum-solution-grade-1\"\u003eSee the certificate and its dates\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eAnalysis: calcium (Ca) 22.00%, sulphur (S) 18.00%\u003c\/li\u003e\n\u003cli\u003eUse for: calcium and sulphur without a pH change, clay soils, high sodium soils\u003c\/li\u003e\n\u003cli\u003eRate: 250 to 600 g per square metre, sized from a soil test\u003c\/li\u003e\n\u003cli\u003ePack: bulk 500 kg and 1000 kg by quote\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eGypsum is a naturally occurring mineral, calcium sulphate dihydrate, ground to a powder. 0.5 kg of gypsum is about 1 and two thirds cups; 1 kg is about 3 and two thirds cups.\u003c\/p\u003e\n\u003cp\u003eBulk is available in 500 kg and 1000 kg quantities. Email store@seaclifforganics.nz for a quote.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGypsum is calcium sulphate, a neutral salt. It supplies calcium and sulphur but does not neutralise acid, so it adds calcium without lifting pH.\u003c\/li\u003e\n\u003cli\u003eCalcium helps clay particles bind into crumbs, which is why gypsum is used to open up heavy clay and improve drainage and root depth.\u003c\/li\u003e\n\u003cli\u003eCalcium from gypsum displaces sodium from clay, the standard treatment for sodic soils.\u003c\/li\u003e\n\u003cli\u003eGypsum dissolves slowly in soil water over months, releasing calcium and sulphur together. It is more soluble than lime, so its calcium moves down into the root zone.\u003c\/li\u003e\n\u003cli\u003eSulphur builds proteins, oils and flavour compounds. A shortage shows as pale young leaves.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAnalysis\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSulphur (S) 18.00%\u003c\/li\u003e\n\u003cli\u003eCalcium (Ca) 22.00%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVegetables: 250 to 600 g (275 to 660 mL) per square metre of soil, sized from the calcium and sulphur shortfall on a soil test.\u003c\/li\u003e\n\u003cli\u003eFlowers: 250 g (275 mL) per square metre of soil.\u003c\/li\u003e\n\u003cli\u003eModified media and potting soil: three quarters of a cup per 50 L.\u003c\/li\u003e\n\u003cli\u003eSoil test for optimum levels and for the calcium to magnesium balance before you apply. Our fertiliser calculator (\/pages\/fertiliser-calculator) offers gypsum at 250, 400 or 600 g per square metre for a tested shortfall.\u003c\/li\u003e\n\u003cli\u003eGypsum does not raise pH. If the soil is acid and calcium is low, lime is the tool, not gypsum.\u003c\/li\u003e\n\u003cli\u003eGypsum leaches in a wet climate. Retest after a couple of seasons rather than reapplying by habit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-65-gypsum-calcium-without-ph\"\u003eGypsum: calcium without the pH\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-47-sulphur\"\u003eSulphur: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-41-calcium-magnesium-till\"\u003eCalcium, magnesium, and the one-off till\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open the bag in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and dry.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"4kg","offer_id":32986795016215,"sku":"SCOGYP04KG","price":17.5,"currency_code":"NZD","in_stock":true},{"title":"25kg","offer_id":32986795048983,"sku":"SCOGYP25KG","price":60.0,"currency_code":"NZD","in_stock":true},{"title":"500kg","offer_id":39957376499735,"sku":"SCOGYP500KG","price":900.0,"currency_code":"NZD","in_stock":true},{"title":"1000kg","offer_id":39957376532503,"sku":null,"price":1500.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/files\/SeacliffMockBags-Gypsum1WM.jpg?v=1747707916"},{"product_id":"gypsum-slow-release","title":"Granulated Gypsum","description":"\u003ch2\u003eGranulated Gypsum\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eGranulated Gypsum is natural calcium sulphate in a granular form instead of a fine powder, so it broadcasts evenly with little dust. It supplies calcium and sulphur without changing soil pH and is used to open up clay and treat high sodium soils.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: amendment (calcium sulphate, granular)\u003c\/li\u003e\n\u003cli\u003eSupplier certificate on file: BioGro licence 297. \u003ca href=\"\/pages\/organic-certificates#gypsum-slow-release\"\u003eSee the certificate and its dates\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eAnalysis: calcium (Ca) 22%, sulphur (S) 18% (calcium sulphate dihydrate)\u003c\/li\u003e\n\u003cli\u003eUse for: calcium and sulphur without a pH change, clay soils, high sodium soils, broadcast application\u003c\/li\u003e\n\u003cli\u003eRate: 250 to 600 g per square metre, sized from a soil test, dug in and watered\u003c\/li\u003e\n\u003cli\u003eForm: granules, low dust\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eGranulated gypsum is the same mineral as our powdered gypsum, calcium sulphate dihydrate, formed into granules. The granular form is suited to broadcasting by hand or spreader and keeps dust down. Typical analysis: calcium (Ca) 22%, sulphur (S) 18%.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGypsum is calcium sulphate, a neutral salt. It supplies calcium and sulphur but does not neutralise acid, so it adds calcium without lifting pH.\u003c\/li\u003e\n\u003cli\u003eCalcium helps clay particles bind into crumbs, which is why gypsum is used to open up heavy clay and improve drainage and root depth.\u003c\/li\u003e\n\u003cli\u003eCalcium from gypsum displaces sodium from clay, the standard treatment for sodic soils.\u003c\/li\u003e\n\u003cli\u003eGypsum dissolves slowly in soil water over months, releasing calcium and sulphur together. It is more soluble than lime, so its calcium moves down into the root zone.\u003c\/li\u003e\n\u003cli\u003eSulphur builds proteins, oils and flavour compounds. A shortage shows as pale young leaves.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAnalysis\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCalcium (Ca) 22%\u003c\/li\u003e\n\u003cli\u003eSulphur (S) 18%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVegetables: 250 to 600 g per square metre of soil, sized from the calcium and sulphur shortfall on a soil test. Dig in and water in.\u003c\/li\u003e\n\u003cli\u003eFlowers: 250 g per square metre, mixed and watered into the soil.\u003c\/li\u003e\n\u003cli\u003eSoil test first. Our fertiliser calculator (\/pages\/fertiliser-calculator) offers gypsum at 250, 400 or 600 g per square metre for a tested shortfall.\u003c\/li\u003e\n\u003cli\u003eGypsum does not raise pH. If the soil is acid and calcium is low, lime is the tool, not gypsum.\u003c\/li\u003e\n\u003cli\u003eGranules dissolve more slowly than powder, so allow longer before judging the result.\u003c\/li\u003e\n\u003cli\u003eGypsum leaches in a wet climate. Retest rather than reapplying by habit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-65-gypsum-calcium-without-ph\"\u003eGypsum: calcium without the pH\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-47-sulphur\"\u003eSulphur: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-04-particle-size\"\u003eParticle size sets the clock\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open the bag in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and dry.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"2kg","offer_id":39323379007511,"sku":"SCOGYPGRAN2KG","price":13.0,"currency_code":"NZD","in_stock":false},{"title":"4kg","offer_id":39323379040279,"sku":"SCOGYPGRAN4KG","price":25.0,"currency_code":"NZD","in_stock":false},{"title":"10kg","offer_id":39895927422999,"sku":"SCOGYPGRAN10KG","price":74.9,"currency_code":"NZD","in_stock":false},{"title":"25kg","offer_id":39323379073047,"sku":"SCOGYPGRAN25KG","price":152.9,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/files\/SeacliffMockBags-GranulatedGypsum1WM.jpg?v=1747707891"},{"product_id":"mussel-shell-flour","title":"Mussel Meal (nitrogen+)","description":"\u003ch2\u003eMussel Meal (nitrogen)\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eMussel Meal is dried, ground New Zealand mussel meat, an organic nitrogen fertiliser with 8.6% nitrogen plus sulphur, potassium and trace elements. It suits soil building and top dressing for medical cannabis, vegetables and fruit.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: single input amendment (dried mussel meal, not shell flour)\u003c\/li\u003e\n\u003cli\u003eSupplier certificate on file: BioGro licence 202. \u003ca href=\"\/pages\/organic-certificates#mussel-shell-flour\"\u003eSee the certificate and its dates\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eAnalysis: 8.6% nitrogen, 1.9% phosphorus as P\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e5\u003c\/sub\u003e (0.85% elemental P), 1.3% potassium as K\u003csub\u003e2\u003c\/sub\u003eO (1.1% elemental K), 2% sulphur, 3.6% sodium\u003c\/li\u003e\n\u003cli\u003eUse for: organic nitrogen in soil mixes, beds and top dressing\u003c\/li\u003e\n\u003cli\u003eRate: 430 g (712 ml) per square metre of bed, or 145 g (240 ml) per 50 litres of media, for the heavy feeder nitrogen target\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eMussel Meal is the meat of New Zealand farmed mussels, dried and milled. It is a protein meal, so the nitrogen is bound in protein and is released as soil microbes digest it. It is not crushed shell: the calcium content is only 0.55%.\u003c\/p\u003e\n\u003cp\u003eThe analysis below is the Cawthron Institute report (ICP-MS) for this material.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSupplies nitrogen for protein and chlorophyll: leaf and stem growth.\u003c\/li\u003e\n\u003cli\u003eBrings sulphur (2%) and a little potassium and phosphorus with the nitrogen.\u003c\/li\u003e\n\u003cli\u003eReleases over weeks as the protein breaks down, so it works best mixed into the soil ahead of planting; top dressing also works.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAnalysis\u003c\/h3\u003e\n\u003cp\u003eNPK = 8.6 - 1.9 - 1.3 (N, P\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e5\u003c\/sub\u003e, K\u003csub\u003e2\u003c\/sub\u003eO); elemental 8.6 - 0.85 - 1.1\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNitrogen (N): 8.60%\u003c\/li\u003e\n\u003cli\u003ePhosphorus (P\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e5\u003c\/sub\u003e): 1.95%\u003c\/li\u003e\n\u003cli\u003ePhosphorus (P, elemental): 0.85%\u003c\/li\u003e\n\u003cli\u003ePotassium (K\u003csub\u003e2\u003c\/sub\u003eO): 1.33%\u003c\/li\u003e\n\u003cli\u003ePotassium (K, elemental): 1.10%\u003c\/li\u003e\n\u003cli\u003eSulphur (S): 2.00%\u003c\/li\u003e\n\u003cli\u003eCalcium (Ca): 0.55%\u003c\/li\u003e\n\u003cli\u003eMagnesium (Mg): 0.42%\u003c\/li\u003e\n\u003cli\u003eSodium (Na): 3.60%\u003c\/li\u003e\n\u003cli\u003eIron (Fe): 0.04%\u003c\/li\u003e\n\u003cli\u003eCopper (Cu): 3.4 mg\/kg\u003c\/li\u003e\n\u003cli\u003eManganese (Mn): 9.1 mg\/kg\u003c\/li\u003e\n\u003cli\u003eZinc (Zn): 50.0 mg\/kg\u003c\/li\u003e\n\u003cli\u003eBoron (B): 32.0 mg\/kg\u003c\/li\u003e\n\u003cli\u003eCobalt (Co): 0.47 mg\/kg\u003c\/li\u003e\n\u003cli\u003eMolybdenum (Mo): 0.66 mg\/kg\u003c\/li\u003e\n\u003cli\u003eSelenium (Se): 2.2 mg\/kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBest incorporated into the soil; top dressing is also effective.\u003c\/li\u003e\n\u003cli\u003eHeavy feeder nitrogen target of 150 ppm (about 336 kg of nitrogen per hectare):\u003c\/li\u003e\n\u003cli\u003eBeds: 430 g (712 ml) per square metre.\u003c\/li\u003e\n\u003cli\u003eModified media or compost: 2900 g (4800 ml) per cubic metre.\u003c\/li\u003e\n\u003cli\u003eSmaller batches: 145 g (240 ml) per 50 litres of media.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-42-nitrogen\"\u003eNitrogen: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-05-nitrogen-whole-crop\"\u003eNitrogen for the whole crop\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-77-every-amendment-brings-passengers\"\u003eEvery amendment brings passengers\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and dry.\u003c\/li\u003e\n\u003cli\u003eStrong smell when wet; mix it in and keep it away from pets.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"1kg","offer_id":39569816190999,"sku":"MUSME2kg","price":15.0,"currency_code":"NZD","in_stock":true},{"title":"5kg","offer_id":39569816223767,"sku":"MUSME4kg","price":55.0,"currency_code":"NZD","in_stock":true},{"title":"10kg","offer_id":39569816256535,"sku":"MUSME10kg","price":100.0,"currency_code":"NZD","in_stock":true},{"title":"20kg","offer_id":39957343272983,"sku":"MUSME25KG","price":145.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/files\/SeacliffMockBags-MusselMeal1WM.jpg?v=1747707854"},{"product_id":"winstone-gypsum-clay-breaker-8kg","title":"Winstone Gypsum Clay Breaker 8kg","description":"\u003ch2\u003eWinstone Gypsum Clay Breaker 8 kg\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eWinstone Gypsum Clay Breaker is a bagged natural gypsum (calcium sulphate) for loosening clay and compacted garden soil. It adds calcium and sulphur without changing pH, so it suits vegetables, flowers, fruit trees, lawns and acid loving natives alike. This is the 8 kg bag.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: amendment (calcium sulphate, clay breaker)\u003c\/li\u003e\n\u003cli\u003eUse for: heavy clay, compacted soil, calcium and sulphur without a pH change\u003c\/li\u003e\n\u003cli\u003eRate: not printed on this page; follow the rate on the Winstone bag\u003c\/li\u003e\n\u003cli\u003ePack: 8 kg bag\u003c\/li\u003e\n\u003cli\u003eAlso available: \u003ca href=\"\/products\/winstone-gypsum-clay-breaker-25kg\"\u003e25 kg bag\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eClay Breaker is Winstone's gypsum, calcium sulphate dihydrate. Gypsum is 23.3% calcium and 18.6% sulphur; the bag carries Winstone's own typical analysis.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCalcium from gypsum helps clay particles bind into crumbs, so heavy and compacted soil opens up, drains better and lets roots go deeper.\u003c\/li\u003e\n\u003cli\u003eGypsum is a neutral salt. It does not move pH, which is why it can go on acid loving New Zealand natives and citrus as well as the vegetable garden and lawn.\u003c\/li\u003e\n\u003cli\u003eCalcium displaces sodium from clay, the standard treatment for sodic soils.\u003c\/li\u003e\n\u003cli\u003eIt also supplies sulphur, which plants use for proteins, oils and flavour compounds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSuitable for vegetables, flowers, shrubs, citrus, fruit trees, large trees including acid loving New Zealand natives, and lawns.\u003c\/li\u003e\n\u003cli\u003eApply at any time of year. For best results apply once in spring and again in autumn.\u003c\/li\u003e\n\u003cli\u003eNew beds: dig into the soil before planting.\u003c\/li\u003e\n\u003cli\u003eEstablished lawns and trees: spread over the surface and water in well.\u003c\/li\u003e\n\u003cli\u003eGypsum does not raise pH. If the soil is acid and calcium is low, lime is the tool, not gypsum.\u003c\/li\u003e\n\u003cli\u003eClay with plenty of calcium already will not change much. A soil test tells you which.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-65-gypsum-calcium-without-ph\"\u003eGypsum: calcium without the pH\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-41-calcium-magnesium-till\"\u003eCalcium, magnesium, and the one-off till\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-47-sulphur\"\u003eSulphur: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open the bag in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and dry.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"Default Title","offer_id":40431179989015,"sku":"INTELLICLAY8","price":19.9,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/products\/GYSPUM.png?v=1747707723"},{"product_id":"winstone-gypsum-clay-breaker-25kg","title":"Winstone Gypsum Clay Breaker 25kg","description":"\u003ch2\u003eWinstone Gypsum Clay Breaker 25 kg\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eWinstone Gypsum Clay Breaker is a bagged natural gypsum (calcium sulphate) for loosening clay and compacted garden soil. It adds calcium and sulphur without changing pH, so it suits vegetables, flowers, fruit trees, lawns and acid loving natives alike. This is the 25 kg bag.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: amendment (calcium sulphate, clay breaker)\u003c\/li\u003e\n\u003cli\u003eUse for: heavy clay, compacted soil, calcium and sulphur without a pH change\u003c\/li\u003e\n\u003cli\u003eRate: not printed on this page; follow the rate on the Winstone bag\u003c\/li\u003e\n\u003cli\u003ePack: 25 kg bag\u003c\/li\u003e\n\u003cli\u003eAlso available: \u003ca href=\"\/products\/winstone-gypsum-clay-breaker-8kg\"\u003e8 kg bag\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eClay Breaker is Winstone's gypsum, calcium sulphate dihydrate. Gypsum is 23.3% calcium and 18.6% sulphur; the bag carries Winstone's own typical analysis.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCalcium from gypsum helps clay particles bind into crumbs, so heavy and compacted soil opens up, drains better and lets roots go deeper.\u003c\/li\u003e\n\u003cli\u003eGypsum is a neutral salt. It does not move pH, which is why it can go on acid loving New Zealand natives and citrus as well as the vegetable garden and lawn.\u003c\/li\u003e\n\u003cli\u003eCalcium displaces sodium from clay, the standard treatment for sodic soils.\u003c\/li\u003e\n\u003cli\u003eIt also supplies sulphur, which plants use for proteins, oils and flavour compounds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSuitable for vegetables, flowers, shrubs, citrus, fruit trees, large trees including acid loving New Zealand natives, and lawns.\u003c\/li\u003e\n\u003cli\u003eApply at any time of year. For best results apply once in spring and again in autumn.\u003c\/li\u003e\n\u003cli\u003eNew beds: dig into the soil before planting.\u003c\/li\u003e\n\u003cli\u003eEstablished lawns and trees: spread over the surface and water in well.\u003c\/li\u003e\n\u003cli\u003eGypsum does not raise pH. If the soil is acid and calcium is low, lime is the tool, not gypsum.\u003c\/li\u003e\n\u003cli\u003eClay with plenty of calcium already will not change much. A soil test tells you which.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-65-gypsum-calcium-without-ph\"\u003eGypsum: calcium without the pH\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-41-calcium-magnesium-till\"\u003eCalcium, magnesium, and the one-off till\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-47-sulphur\"\u003eSulphur: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open the bag in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and dry.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"Default Title","offer_id":40431180021783,"sku":"INTELLICLAY25","price":34.9,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/products\/187808xlg.webp?v=1747707722"},{"product_id":"seacliff-organics-liquid-calcium","title":"Seacliff Organics Calcium acetate( WCA)","description":"\u003ch2\u003eSeacliff Organics Liquid Calcium (calcium acetate, WCA)\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eSeacliff Organics Liquid Calcium is a calcium acetate solution, a water soluble calcium you can measure by the millilitre into a foliar spray, a coco feed or a living soil drench. Korean Natural Farming growers know the same thing as WCA, water soluble calcium.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: liquid calcium supplement (calcium acetate)\u003c\/li\u003e\n\u003cli\u003eAnalysis: each 4 mL per litre of water adds about 100 ppm calcium (Ca)\u003c\/li\u003e\n\u003cli\u003eUse for: fast calcium by foliar spray, blossom end rot and tip burn, coco fertigation, living soil drench\u003c\/li\u003e\n\u003cli\u003eRate: 5 to 10 mL per litre as a living soil drench (125 to 250 ppm Ca)\u003c\/li\u003e\n\u003cli\u003eForm: liquid, measured by volume\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eCalcium acetate is the calcium salt of acetic acid, the acid in vinegar. Unlike lime or gypsum it is fully water soluble, so the calcium is available the moment it is mixed and the dose can be set in parts per million. Each 4 mL per litre adds about 100 ppm elemental calcium and raises the EC of the solution accordingly.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCalcium builds cell walls and root tips. It is immobile in the plant, so a shortage shows first as twisted new growth, tip burn and blossom end rot in fruit.\u003c\/li\u003e\n\u003cli\u003eA soluble calcium drench or foliar reaches the plant in hours, which makes it the fast fix. Fix the soil or media afterwards with lime or gypsum.\u003c\/li\u003e\n\u003cli\u003eIn coco coir, which holds little calcium of its own, a measured calcium feed replaces what the media cannot supply.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFoliar spray: 20 to 30 mL per litre, which gives 500 to 750 ppm Ca.\u003c\/li\u003e\n\u003cli\u003eBlossom end rot or tip burn, foliar: 25 to 35 mL per litre, 625 to 875 ppm Ca.\u003c\/li\u003e\n\u003cli\u003eCoco coir fertigation: 5 to 8 mL per litre, 125 to 200 ppm Ca.\u003c\/li\u003e\n\u003cli\u003eLiving soil drench or irrigation: 5 to 10 mL per litre, 125 to 250 ppm Ca.\u003c\/li\u003e\n\u003cli\u003eEach 4 mL per litre adds about 100 ppm elemental calcium and raises the solution EC or TDS accordingly.\u003c\/li\u003e\n\u003cli\u003eDo not tank mix with silicates or phosphates: soluble calcium reacts with them and drops out as a solid. Jar test before mixing with any other input.\u003c\/li\u003e\n\u003cli\u003eEvery dose raises EC. Count it in your feed, especially in coco.\u003c\/li\u003e\n\u003cli\u003eFoliar sprays go on with the lights off or in the cool of the day, both sides of the leaf, with a surfactant.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-45-calcium\"\u003eCalcium: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-31-foliar-feeding\"\u003eFoliars: fast fixes, then the soil\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-32-yucca-quillaja-surfactants\"\u003eYucca and quillaja: make water wet\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and stored out of direct sunlight.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"1L","offer_id":40515001810967,"sku":"SCOLIQUCAL1L","price":30.0,"currency_code":"NZD","in_stock":true},{"title":"5L","offer_id":40515001843735,"sku":"SCOLIQUCAL5L","price":119.0,"currency_code":"NZD","in_stock":true}]},{"product_id":"silica-cal-pro","title":"Calsil Boost (wollastonite )","description":"\u003ch2\u003eCalsil Boost (wollastonite)\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eCalsil Boost is ground wollastonite, a natural calcium silicate mineral that supplies silicon and calcium to soil and potting mixes. Growers use it to build silicon into plants early for stronger stems and cell walls, with a mild liming effect as a passenger.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: amendment (calcium silicate, wollastonite)\u003c\/li\u003e\n\u003cli\u003eAnalysis: calcium silicate; a pure mineral is 34% calcium and 24% silicon, natural grades run lower (batch sheet on request)\u003c\/li\u003e\n\u003cli\u003eUse for: silicon and calcium in soil, potting mixes and compost\u003c\/li\u003e\n\u003cli\u003eRate: 100 g (half a cup) per square metre of garden or field soil\u003c\/li\u003e\n\u003cli\u003eForm: powder\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eWollastonite is calcium silicate (CaSiO\u003csub\u003e3\u003c\/sub\u003e): a pure mineral is 48% CaO and 52% SiO\u003csub\u003e2\u003c\/sub\u003e, which is 34% calcium and 24% silicon as elements; natural grades run lower, so ask us for the current batch sheet. Rich in calcium and silicon for stronger plant structures.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSilicon hardens cell walls and stems and helps plants resist mildew and stress. It is taken up as the mineral dissolves, so build it in early rather than at the end.\u003c\/li\u003e\n\u003cli\u003eCalcium builds cell walls and root tips. It is immobile in the plant, so a shortage shows first as twisted new growth.\u003c\/li\u003e\n\u003cli\u003eCalcium silicate also neutralises soil acid, at roughly 60 to 90% of the strength of calcium carbonate by weight, so count it as part of your liming.\u003c\/li\u003e\n\u003cli\u003eWollastonite releases silicon far faster than basalt or andesite rock dust, which makes it the more direct silicon tool.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSoil amendment, gardens and field: 100 g (half a cup) per square metre. Mix into the soil before planting, or top dress as needed.\u003c\/li\u003e\n\u003cli\u003ePotting mixes: 15 g (one tablespoon) per 4 L of soil or media, mixed through.\u003c\/li\u003e\n\u003cli\u003eComposting: 50 g (a quarter of a cup) per 28 L of compost material. Mix well for even distribution.\u003c\/li\u003e\n\u003cli\u003eIt raises pH. If pH is already at the top of your range (we run living soil at 6.2 to 7.2), count the lime effect before adding it.\u003c\/li\u003e\n\u003cli\u003eEvery dose adds calcium. Read the calcium line on your soil test, not just pH.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-54-silicon\"\u003eSilicon: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-45-calcium\"\u003eCalcium: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-60-ph-is-not-a-calcium-test\"\u003epH is not a calcium test\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open the bag in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed and dry.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"500g","offer_id":41705681584151,"sku":"SCOCALSIL50","price":18.0,"currency_code":"NZD","in_stock":true},{"title":"2kg","offer_id":41705681616919,"sku":"SCOCALSIL2","price":70.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/files\/gypsum_886318a3-0b21-4af3-ae61-e7704f730375.jpg?v=1747707672"},{"product_id":"calboost-micronized-calcium-carbonate","title":"Calboost ( Micronized Calcium Carbonate)","description":"\u003ch2\u003eCalBoost (micronised calcium carbonate)\u003c\/h2\u003e\n\u003cp class=\"sc-lede\"\u003eCalBoost is ultra fine micronised calcium carbonate, a powdered lime ground so small it can be suspended in water for a soil drench or foliar spray. It supplies calcium to living soil and media between dressings of lime.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: amendment (calcium carbonate, water suspendable)\u003c\/li\u003e\n\u003cli\u003eAnalysis: calcium carbonate; pure calcium carbonate is 40% calcium (no batch sheet published yet)\u003c\/li\u003e\n\u003cli\u003eUse for: calcium by drench, foliar spray or in the feed line\u003c\/li\u003e\n\u003cli\u003eRate: 15 g (one tablespoon) per 4 L of water as a soil drench, every 2 to 4 weeks\u003c\/li\u003e\n\u003cli\u003eForm: micronised powder\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eCalBoost is pure calcium carbonate milled to a very fine particle size. Fine particles have far more surface than ordinary lime, so they dissolve sooner in soil and can be held in suspension long enough to pour or spray. Pure calcium carbonate is 40% calcium by weight.\u003c\/p\u003e\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCalcium builds cell walls and root tips. It is immobile in the plant, so a shortage shows first as twisted or burnt new growth and as blossom end rot in fruit.\u003c\/li\u003e\n\u003cli\u003eThe carbonate part reacts with acid, so CalBoost also nudges soil or media pH upward. Used by drench it is a gentle way to hold pH in a mix that is drifting acid.\u003c\/li\u003e\n\u003cli\u003eFiner is faster: the same mineral at a smaller particle size acts sooner and runs out sooner.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFoliar spray: mix 5 g (one teaspoon) of CalBoost per 4 L of water. Apply as a fine mist to the foliage for thorough coverage. Use every 1 to 2 weeks during the growing season, or as needed.\u003c\/li\u003e\n\u003cli\u003eSoil drench: mix 15 g (one tablespoon) per 4 L of water. Apply to the soil around the base of the plants. Use every 2 to 4 weeks for continuous calcium availability.\u003c\/li\u003e\n\u003cli\u003eHydroponic and feed systems: add 5 g (one teaspoon) per 4 L of nutrient solution as part of the regular feeding schedule.\u003c\/li\u003e\n\u003cli\u003eShake well before use and keep the mix agitated. Apply in the early morning or late afternoon when temperatures are cooler, and avoid peak sunlight to prevent leaf burn.\u003c\/li\u003e\n\u003cli\u003eCompatible with most fertilisers and pesticides, but always run a jar test before mixing with other products.\u003c\/li\u003e\n\u003cli\u003eCalcium carbonate does not dissolve in water. It stays as a suspension, settles fast and can block fine nozzles and drippers. Keep it agitated and flush lines after use.\u003c\/li\u003e\n\u003cli\u003eCarbonate raises pH. Watch the pH of your feed and media, and do not use it where pH is already at the top of the range.\u003c\/li\u003e\n\u003cli\u003eFoliar calcium stays on the leaf it lands on. It is a fast fix for a visible shortage; the soil is where to correct it.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLearn more in fifteen seconds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-45-calcium\"\u003eCalcium: what it does\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-31-foliar-feeding\"\u003eFoliars: fast fixes, then the soil\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/soil-science#sc-04-particle-size\"\u003eParticle size sets the clock\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHandling and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWear a mask to avoid inhaling particles and open the container in a well ventilated area.\u003c\/li\u003e\n\u003cli\u003eWear gloves and eye protection, and wash hands after use.\u003c\/li\u003e\n\u003cli\u003eOnce opened, keep sealed, dry and out of direct sunlight.\u003c\/li\u003e\n\u003cli\u003eNot for human consumption.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Seacliff Organics","offers":[{"title":"50g","offer_id":41705675194391,"sku":"SCOCALBOO50","price":11.0,"currency_code":"NZD","in_stock":true},{"title":"200g","offer_id":41705675227159,"sku":"SCOCALBOO200","price":50.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/9104\/0361\/files\/gypsum_88045c3b-2edb-4b62-90be-9126f2dc157c.jpg?v=1728617517"}],"url":"https:\/\/seaclifforganics.nz\/collections\/amendments-calcium-magnesium.oembed","provider":"Seacliff Organics","version":"1.0","type":"link"}